feat: surface time in the enroll-by date column

[brobro10000]

Surfaces the enroll by date time within the learner credit allocation table.
Updates the text within the enroll by tool tip to remove any indication of time.

For all changes

• Ensure adequate tests are in place (or reviewed existing tests cover changes)

Only if submitting a visual change

• Ensure to attach screenshots
• Ensure to have UX team confirm screenshots

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.56%. Comparing base (6c82806) to head (e23040c).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1312   +/-   ##
=======================================
  Coverage   85.56%   85.56%           
=======================================
  Files         567      567           
  Lines       12598    12598           
  Branches     2633     2670   +37     
=======================================
  Hits        10780    10780           
+ Misses       1757     1756    -1     
- Partials       61       62    +1     

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